GAE上有这种refer图片的代码么？

PHP代码是这种：

<?php
$url = $_GET["url"];
//$url = str_replace("http:/","http://",$url);
$dir = pathinfo($url);
$host = $dir['dirname'];
$refer = $host.'/';
$ch = curl_init($url);
curl_setopt ($ch, CURLOPT_REFERER, $refer);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);//激活可修改页面,Activation can modify the page
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
$data = curl_exec($ch);
curl_close($ch);
header("Content-type: image/jpeg");//代码支持jpeg，需要自己修改支持其他图片格式,
print( $data );
?>

使用方法：http://your-domain.com/showpic.php?url=